Strain-gated piezotronic logic nanodevices.

Fabrication of the strain-gated inverter (SGI) The SGI was fabricated by bonding two ZnO NWs laterally on a Dura-Lar film. The thickness of the Dura-Lar film is 0.5 mm. The ZnO NWs were synthesized via a physical vapor deposition method reported elsewhere [32] and typically have diameters of 300 nm and lengths of 400 μm (Fig. 1a). The films were first cleaned with acetone, isopropyl alcohol and DI water by sonication, after which, the Dura-Lar films were dried by nitrogen gas blowing. One ZnO NW was placed flat on the top surface of the Dura-Lar film first using a probe station (Cascade Microtech, Inc.) under an optical microscope (Leica Microsystems, Inc.). Silver paint (Ted Pella, Inc.) was applied at both ends of the ZnO NW for electrical contacts. The second ZnO NW was placed on the bottom surface of the Dura-Lar film in the same way.